Good point, that could of been one of the reasons. My opinion is there was more material in the area where it failed as compared to my longbows so I dont it was a material size or design problem.The biggest contributing factors in my opinion is that the grain of the mesquite did not run completely parallel from each end of the riser. The grain had about a 15 degree slant from the belly of the riser running up towards the back of the bow and the break is fairly clean on that axis the grain is running. I should have checked out that piece of wood better before using it.
I dont think I have the skills to salvage this riser 2x, so I think I will be working on a new one soon...